rosetta 200 with mbox. big difference?

If I use a rosetta on the spdif ins on my mbox, being still limited to 24bit/48kHz in ProTools LE, amd I going to notice a big difference in sound quality? I use a Rode K2 with a Vipre and I'm pretty damned happy with the sound. An 1176 is my next purchase (very soon).
Is this upgrade in converters really going to blow my mind if I'm not able to work in anything above 24bit/48kHz?
Steve

I'm really sure lots of people will disagree, but anyway; At work I work with ams-neve converters, at home with my motu 828 mkII...
I'm completely sure that the differences are so subtle, you can only hear it when A-B ing..
I'm just a broadcast audio engineer, I have for sure won no grammies, so I don't pretend to have all the answers..